From: James Grant <jamesg@zaltys.org>
To: Alexandre Belloni <alexandre.belloni@bootlin.com>,
Felipe Balbi <balbi@kernel.org>,
Vladimir Zapolskiy <vz@mleia.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org, James Grant <james.grant@jci.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Sylvain Lemieux <slemieux.tyco@gmail.com>
Subject: Re: [PATCH] usb: gadget: udc: lpc32xx: allocate descriptor with GFP_ATOMIC
Date: Mon, 13 May 2019 23:33:11 +1200 [thread overview]
Message-ID: <417966d0-e656-b4e6-c1ea-b53bf687a870@zaltys.org> (raw)
In-Reply-To: <20190510124248.2430-1-alexandre.belloni@bootlin.com>
Tested with a board containing LPC3250 SOC and STOTG04 PHY by using
serial gadget.
Needed patch series starting with "[PATCH 0/5] usb: gadget: udc:
lpc32xx: add stotg04 phy support" also.
Tested-by: James Grant <jamesg@zaltys.org>
Regards,
James Grant.
On 11/05/2019 00:42, Alexandre Belloni wrote:
> Gadget drivers may queue request in interrupt context. This would lead to
> a descriptor allocation in that context. In that case we would hit
> BUG_ON(in_interrupt()) in __get_vm_area_node.
>
> Signed-off-by: Alexandre Belloni<alexandre.belloni@bootlin.com>
> ---
> drivers/usb/gadget/udc/lpc32xx_udc.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/gadget/udc/lpc32xx_udc.c b/drivers/usb/gadget/udc/lpc32xx_udc.c
> index d8f1c60793ed..b706d9c85a35 100644
> --- a/drivers/usb/gadget/udc/lpc32xx_udc.c
> +++ b/drivers/usb/gadget/udc/lpc32xx_udc.c
> @@ -938,7 +938,7 @@ static struct lpc32xx_usbd_dd_gad *udc_dd_alloc(struct lpc32xx_udc *udc)
> struct lpc32xx_usbd_dd_gad *dd;
>
> dd = (struct lpc32xx_usbd_dd_gad *) dma_pool_alloc(
> - udc->dd_cache, (GFP_KERNEL | GFP_DMA), &dma);
> + udc->dd_cache, (GFP_ATOMIC | GFP_DMA), &dma);
> if (dd)
> dd->this_dma = dma;
>
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next prev parent reply other threads:[~2019-05-13 11:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-10 12:42 [PATCH] usb: gadget: udc: lpc32xx: allocate descriptor with GFP_ATOMIC Alexandre Belloni
2019-05-10 15:59 ` Joe Perches
2019-05-13 11:33 ` James Grant [this message]
2019-06-18 7:33 ` Felipe Balbi
2019-06-18 7:46 ` Alexandre Belloni
2019-06-18 8:45 ` Felipe Balbi
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